zerolag macd - alerts arrows.mq5

#property indicator_separate_window
#property indicator_buffers 4
#property indicator_color1 clrDeepSkyBlue
#property indicator_color2 clrDimGray
#property indicator_color3 clrDeepSkyBlue
#property indicator_color4 clrRed
#property indicator_width2 2
#property indicator_width3 2

extern string timeFrame        = "current time frame";
extern int    FastEMA          = 12;
extern int    SlowEMA          = 26;
extern int    SignalEMA        =  9;
extern int    AlertsArrowsOn   =  0;
extern int    MacdPrice        = PRICE_CLOSE;
extern bool   Interpolate      = true;
extern bool   arrowsVisible    = true;
extern string arrowsIdentifier = "ZLMacdArrows";
extern int    UpArrowSymbolCode = 241;
extern int    DownArrowSymbolCode = 242;
extern color  arrowsUpColor    = clrDeepSkyBlue;
extern color  arrowsDnColor    = clrRed;
extern int    UpArrowSize      = 1;
extern int    DownArrowSize      = 1;
extern bool   alertsOn         = false;
extern bool   alertsOnCurrent  = false;
extern bool   alertsMessage    = false;
extern bool   alertsSound      = false;
extern bool   alertsEmail      = false;

double macdBuffer[], machBuffer[], signBuffer[], osmaBuffer[], trend[];
double workBuffer[][6];

string CrossDescription, IndicatorFileName;
bool   calculatingMacd = false;
bool   returningBars   = false;
int    TimeFrame;

int OnInit()
{
      // код доступен только после оплаты
   }

int deinit()
{
   string lookFor       = arrowsIdentifier+":";
   int    lookForLength = StringLen(lookFor);
   for (int i=ObjectsTotal()-1; i>=0; i--)
   {
      string objectName = ObjectName(i);
         if (StringSubstr(objectName,0,lookForLength) == lookFor) ObjectDelete(objectName);
   }
   return(0);
}

int start()
{
      // код доступен только после оплаты
   }
   int counted_bars = IndicatorCounted();
   int limit,i;

   if(counted_bars < 0) return(-1);
   if(counted_bars > 0) counted_bars--;
           limit = MathMin(Bars-counted_bars,Bars-1);

           if (returningBars)   { macdBuffer[0] = limit; return(0); }
           if (calculatingMacd) { CalculateMacd(limit);  return(0); }
           if (TimeFrame > Period()) limit = MathMax(limit,MathMin(Bars,iCustom(NULL,TimeFrame,IndicatorFileName,"returnBars",0,0)*TimeFrame/Period()));

 	for(i = limit; i >= 0; i--)
   {
      int      shift1 = iBarShift(NULL,TimeFrame,Time[i]);
      datetime time1  = iTime    (NULL,TimeFrame,shift1);

         macdBuffer[i] = iCustom(NULL,TimeFrame,IndicatorFileName,"calculateMACD",FastEMA,SlowEMA,SignalEMA,MacdPrice,2,shift1);
         signBuffer[i] = iCustom(NULL,TimeFrame,IndicatorFileName,"calculateMACD",FastEMA,SlowEMA,SignalEMA,MacdPrice,3,shift1);
         machBuffer[i] = macdBuffer[i];
         osmaBuffer[i] = macdBuffer[i]-signBuffer[i];
         switch(AlertsArrowsOn)
         {
            case 0 : 
                  if (osmaBuffer[i]>0) trend[i] =  1;
                  if (osmaBuffer[i]<0) trend[i] = -1;
                  break;
            case 1 : 
                  if (macdBuffer[i]>0) trend[i] =  1;
                  if (macdBuffer[i]<0) trend[i] = -1;
                  break;
            case 2 : 
                  if (signBuffer[i]>0) trend[i] =  1;
                  if (signBuffer[i]<0) trend[i] = -1;
                  break;
         }
         manageArrow(i);
         if (TimeFrame <= Period() || shift1==iBarShift(NULL,TimeFrame,Time[i-1])) continue;
         if (!Interpolate) continue;		 

         for(int n = 1; i+n < Bars && Time[i+n] >= time1; n++) continue;	
         double factor = 1.0 / n;
         for(int k = 1; k < n; k++)
            {
               macdBuffer[i+k] = k*factor*macdBuffer[i+n] + (1.0-k*factor)*macdBuffer

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